Help for Investigating Errors......

My computer sort of crash yesterday morning....restarted in safe mood...then normal mode...

I followed the instructions in your sticky thread on protecting the comp from spyware etc Unable system restore, allowed viewing of hidden files n folders, antispyware scans, virusscan + 2 online scans yesterday

seems alright for the rest of the day (16hrs)

The error signature is:

BCCode: 51 BCP1: 00000003 BCP2:00000001 BCP3: 00FC9600
BCP4: E16D8C90 OSVer: 5_1_2600 SP: 2_0

Today, it did the same thing....Error report is different though...now it seems alright again....Just wondering whether u guys could help me troubleshoot i/e for any software or hardware conflicts...the details on my Computer are as below:

Operating System: win xp 2sp
Internet Browser: ie
Instant Messenger: Msn messenger, yahoo messenger
Tele Services: Skype
Security/Antivirus: Sygate + mcafee viruscan 8.0 (internal suite w/o the other components)
Adaware/Spyware Remover: adware + spybot +spyware blaster +microsoft antispyware
Music Player: win media 10 + winamp + realplayer
Computer cleaner etc: ccleaner
Bittorrent Client: azureus

HP (Compaq presario m2000)
Intel (r) Pentium (R) M Processor 1.73GHz
1.73 GHz, 0.99 GB of ram

Thanks